of dttisbttbg



July 2, 1929. I

A. BESTA CIRCULATING APPARATUS FOR HOT GASES Filed Feb. 10, 1928 eata.

Patented July 2, 1929.

UNITED STATES I 1,719,684 PATENT OFFICE.

nmmamvr BESTA, or nurs'nuae, GERMANY, ASSIGNOR TO cnnmscm'rncnmscnn ensamscnxm mm BESOHRANK'IER HAF'IUNG, or nUIsBURe, GERMANY.

GIBOULATTNG APPARATUS FOR HOT GASES.

Application filed February 10, 1988, Serial No. 258,511, and in Germany February 18, 1927.

The heating of heaters of the most varied kinds, glow retorts for example, by means of heating gases passing round a circuit, is the more economicalthe shorter the paths taken by the heating gases. It is therefore particularly advantageous if the fan efl'ecting the circulation of the hot gases is connected as near as possible to the heater appliance. Hitherto the heating burner has had to be interposed between the heater and the fan that circulates the heating gas, so that longer paths for the heating gas were thereby rendered necessary. By the present invention this disadvantage is obviated and the entire arrangement simplified by a particularly advantageous constructional form of circulating fan and heating appliance.

The invention consists in arranging the burner appliance 'forheating the circulating gases in or on the casing of the heatin gas circulating fan, so as to make the pat s of the heatin gas as short as possible. The burner tube %or the undisturbed burning of the necessary hot supplementar gases may be so arranged that the circulating gases fiow round about it. By arranging a throttling device for the circulating gases in front of the entrance for the heatin gases into the current of circulating gas, t e flow of the circulating gas can be re lated, so

that the strength of the draug t in the burner tube can be adjusted as desired, and the necessary quantities of gas and air can be sucked in by the heating burner itself.

The discharging of the excess gases from the heating gas circulating system may advantageously be efi'ected' at the casing of the heating-gas circulating fan in such a way that a heating of the excess gases by the burner appliance is obviated. The sensible heat of the 'excess gases may be utilized for reheating the quantities of gas and air whic are supplied to the heating burner.

I The accompanying drawin shows one constructional exam le of t e invention.

The retorts 1 in the lieater appliance 2 are secured and heated by heating gases flowing in the direction of the arrows. The

heating gases are supplied through a pi e union 3 to a circulating fan 4.

lower part of the circulating fan 4 is arranged a burner appliance 5, consisting of a burner 6 and a burner tube 7. The heating gases flow round about the burner tube 7, are already preheated by the radiant Atte,

heat, and mix in the passage 8 with the heating-up gases of the burner. From the passage 8 the hot gases, heated to the desired temperature, are again passed in the direction of the arrows round the retorts 1 to the tube 3. At the end of the burner tube 7 are arranged throttling elements 9, which throttle the circulating gases, so that in the passage 8, and accordingly also in the burner tube 7, an optional draught eifect can be adjusted. The excess hot gases are led away through a tube 10 arranged on the upper fan casing, and pass through a double-walled tube 11 into the open. The hot superheated gases are then led off through the central portion of the double walled tube 11 whilst air is led in through the outer annular portion and in the reverse-direction'to the outflowing super heated gases. This air becomes heated by 7 the hot walls of the inner tube and is fed to the burner throu h the tube 12. The supply of gas to t e burner is effected through the pipe 13. For the accurate adjustment of the quantities of air and gas for the burner 6, regulating elements 14 and 15 are arranged in the pipes 12 and 13.

What I claim isze- 1. Circulating apparatus for hot gases, comprising asubstantiallyclosed circuit in which the hot gases circulate, a fan casin forming part of said circuit, a fan in sai casing for circulating the hot es, and a burnerappliance arranged in t e difiuser space of the said fan casing for heating up t e circulating gases, and a throttling device arranged in the circuit before the point at which the products of combustion from the burner appliance enter the circuit, for regulating the flow of the circulating gases.

2. Circulating apparatus for hot ases, comprisin a fan casing, a fan in sai casing for circulating the hot gases, and a burner appliance arranged in said fan casing for eating up the circulating gases, 1 and means for discharging from the fan casing and excess hot gases at a point prior to that at which the heating-up action of the burner appliance occurs.

3. Circulating apparatus for hot gases, comprising a substantially closed circuit in which the hot gases circulate, a fan casing, forming part of saidv circuit, a fan in said casing for circulating the hot gases, and a burner appliance arranged in said fan 0218- ing from the fan casing the excess hot gases at a point prior to that at which the heat ing-up action of the burner appliance occurs.

In testimony whereof I' have signed my name to this specification.

ADALBERT BESTA. 

